Anti-Inflammatory Agents/therapeutic use; Arthritis, Rheumatoid/drug therapy; Aspirin/therapeutic use; Propionates/therapeutic use; Anti-Inflammatory Agents/adverse effects; Arrhythmias, Cardiac/chemically induced; Aspartate Aminotransferases/blood; Aspirin/adverse effects; Blood Sedimentation; Blood Urea Nitrogen; Calcium; Clinical Trials as Topic; Drug Eruptions/etiology; Feces/analysis; Female; Guaiac/analysis; Headache/chemically induced; Hematuria/chemically induced; Humans; Hydrogen-Ion Concentration; Male; Middle Aged; Nausea/chemically induced; Pain; Phenyl Ethers/adverse effects; Phenyl Ethers/therapeutic use; Placebos; Propionates/adverse effects; Tinnitus/chemically induced; Uric Acid/blood; Urine; Vomiting/chemically induced